Hello,
Be careful, as many GDAL package maintainers, including myself, run
older Visual Studio versions on Windows. Declaring this constant is
done in several software projects. It may be considered "ugly", but it
sure works.
-jeff
On 2016-03-03 1:55 PM, Tanuj Kumar wrote:
This is with regard to the bug listed on
https://trac.osgeo.org/gdal/ticket/6388
The fix is to remove the hard coded pi constants, but apparently, using
M_PI from math.h as it is breaks compilation on Visual Studio
http://stackoverflow.com/questions/26065359/m-pi-flagged-as-undeclared-identifier
(I haven't checked it yet myself; that would need me to switch to
windows, and I'm on linux right now)
However, we could also declare #define _USE_MATH_CONSTANTS, and then use
M_PI without declaring it(And not just M_PI, all the other math
constants listed on https://msdn.microsoft.com/en-us/library/4hwaceh6.aspx).
Could someone please check whether math constants work in later versions
of visual studio(Both with and without #define _USE_MATH_CONSTANTS)?
Thank you
Tanuj
--
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/
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